Induction-motor control.



K. A. PAULY.

ENDUCTION MOTOR CONTROL.

APPLICATION FILED JAN.30,1915.

Patented Feb. 6, 1917,

X FOLES X POLES Y PQLES N5 messes:

Inventor": Kariaqi aulg,

LY, 335 SCHENECTADY, NEW YGRK, ASSIGNGB- "330 GENERAL ELEB'EEAQ COMPANY A SGRPORATIOIS ()1? NEW" YDBK.

ZHDUCTIQI$-MOTOR GGIETRGL.

Application filed January 3%, 1915.

" e ii: iteci residing at Sche- "=7 of Schenectady, State oi ve invented cersain new and 9 prevemeiis in Incinction-h'iotor i 'v 1011 the foiiowmg is a spemfi:

meniioii Pei-ates to the contrei of inenci has ioi' its oh iee a novel in ioci of ami, means for, connoiiing such rec-W375 whevehy eiectrioei braking conneofilS may esiebiishei Without opening iections oi the moi-o1- to the alternat ef Sxlipgiy and some w A the motor iosiii'g torque.

is enei, 1 provide the motor with two ereiit pc-ie members, one of 52 with aiiemeting current e ther of which is supeui'i'eiii, when ii is ciesiiieci The eontreiiing means ciiieci; current Wiii Winding before iseonnected from current source and if 12 is s Way motor Wiii never espect. my invention consists iii. suehe itiotor by supplying 21iemetieg current he ene of the wimiings for 210 33113 fining then suppiyiiw aii'rect cur- ?Jhe ether of the windings. during iiioiz from running to emking and then 35 iiisconnecing the sitei'naiing current from ihe iirsi menbiened winaiing and braking the moist h s means the lastmentioned Windbetter unclerstsnling of my inven iii:- 7 re e'ceiice may be had to the foiiowiiig cieseri'giion when in ccii'eeoeion the accamps-flying waiving in which the single iigui'e shows ciiagmmmeticaiiy an induction 1 for control in accordance "my invemien.

to the chewing, 1 represents a imery winciing cennecte for n; poles and a i'eioi'esents e second primary winriing C011- neoiaezi for g; poles. as for instance 8 pole-s Specificetien of Iiecters Zatent.

' Patented FeTq Serial Z530. 5,315).

am 10 poies, respectively. particuiei 5e arrangement of these Winciings to oomin these poie numbers iorms no 'pzii'i of my invention and is weli miderstoed in the a is a source of eiternaiing current e111. e source sf direct current. The some i to he conneeced to the piim winding 1 by a con-ironing switch 5 source 4E: is m'rangeci to be coiiiiecizeci. o3 controiiing' switch 6. Since these Srliefiil are independent, the switch 5 be epe'rto connect winding 1 to 'fahe sou alternating cuirient and at the same i switch 6 may be opexiiteci i0 connect "Wine ings 2 to the source of (iirectcnrreiit. The windings 1 a'mi 2 are of such ciiffeieiit poie 65 number that there will he substenzisiiyiio interference between them, is, the re suhaant zfli erneting eieetiomoti've force duced in Winding" "2 by the elteiimting current Winding 1 viii he iiegiigihie. The 7% meter secondary memhei" which prefei ebiy provided v h we and 9 which eorresgow winciings 1 and 2, rese the same pole numb-e primary windings. T 1'. windings on the seeciio their prevents she wine e sy H alternating through the intei windings. The connected io eoiiector and the Windii'ig S being eon coiiecsoi' rings LE 13 anci A se sisiances is cmnected to coiiecfioi' 11 and 12, this set e75 resistances being a ed to he shorbcireuiteci in steps 0y "I ti'oiling switch A secoiii set 0 eoees 16 is connected to collector and i i and is adapted be she in steps by the conti'oiiing S i The 10130? is operated as 'ici. firj fhg contioiiing switch 15 first thrown into o sition A'in which the primary winding 1 cezmecteci to the alternating current son; 3, secondary Winilig 8 being oofenecied together through the Whole of the set o1 resistances 15. In this position of the com the induction motor will run By moving the controlling nosition B, part of the set of short-circuitcd so that the stance in series with the rotor educed and the motor will then .igher speed. When the switch '0 position C, all of the set of is shortcircuited and the mohighcr speed. If it is now ora llc the motor, the controlling into position A. and the switch 5 is preferably moved iosition A. In this position of the F switch 6, the primary winding 2 3. to the direct current source a vn, one leg of the winding 2 isl in series with the other two legs is. The secondary winding 9' in ion of the controller is connected rough the whole of the set of re- 6, and operates as an armature an alternating current genere current generated flows through "lung; 9 and the non-inductive resistid. develops a back torque propore r 779 I s r is the total resistance of the circuit. his aosition of the controller, '2' is large, the hack torque is small.

o further hrakcthe motor, the conswitch 5 is moved to the off position onnecting the winding 1 from the ping current source 3, and with the ing switch 6 still in position A, the n If that exists to rotate the motor 11 one to the kinetic energy of the motor I masses driven thereby. This tendto rotate the motor is opposed by the or ore-king torque of the winding 9.

"1g the controlling switch 6 into po- 7 part of the set of resistances 16 is ort-c1r uited and consequently r, in the ression for back torque given above, is d, thus increasing the braking torque. switch 6 in position C, still more st of resistances l6 is short-circuited e braking, torque is still further in i As the motor slows down the genlingo e and the reactance a: in the 'ession looth decrease in value, and or system of control is used for an unbalanced hoist, it will he necuse mechanical brake which will action either to stop the motor is slowed down to a predetermined hold the motor stationary after iced.

sciiption of the operation of i.. "usbrated, it will be seen the Ll I B a and transition is made iron motor running to electrical allowing the moat to lose quently there is no speeding up durine" any unbalanced load ing, such as lowering a o' Although I have only illu trolling switches oand as J with three positions, stood that any number or provided. Furthermore, described the windings of v in" eight soles and ten po is well undo tood t he have any inherent i aim in the appended modifications as well an not depart from the split invention.

What I claim as new and cure by Letters Patent or? States, is:--

1. in combination, an alterna source, a direct currentsource, motor having a primary member, said primary men": vided with two windings oi numbers, said secondary member vided with two windings of cor pole numbers, means for connec alternating current source to'one of 11 primary windings, means for connectsaid direct current source to the mary winding, and means -for vai resistances oi the circuits of on said secondary member.

2. in combination, an alternating cu source, a direct-clu'rent source, aninduc motor havinga primary and seconds member, said primary member being vided with two windings of difi erent numbers, said secondary member being vided with two w'. iding's of correspor pole numbers, sets of: resistances, connecting said alternating: current m to one of the primary windings one said sets of resistances to one of senorary windings, and a. second means c necting said. direct current source to other of said primary \Vlll(llI1i;S atrni other set of resistances to the other of secondary windings.

3. The methodof operatiin n j alternating current to one wmdmgs for normal 0permarry windings for braking, 321g said alternating current 'd first mentioned Winding, e resistance of the cirlying direeteurrent to the.

said motor to vary the braking speed of said motor.

In witness whereof, I have hereunto set my hand. this 29th day of January, 1915.

- KARL A. PAULY. Witnesses:

BENJAMIN B. HULL, HELEN ORFORD. 

